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He was Swiss Wawrinka Lead 6-4, 7-5, 2-1 in another Grand Slam This year, before the withdrawal of his Serbian rival to ensure the appearance in the quarterfinals to The American Open.
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Wawrinka led 6-4, 7-5, 2-1 in the last Grand Slam this year, before his Serbian rival retired, ensuring his appearance in the quarterfinals at the US Open.
